Malicious PDF — malware analysis report

Static analysis result for SHA-256 64574dce2d9f3a67…

MALICIOUS

PDF

79.8 KB Created: 2021-05-09 18:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 43b7d70421309d2d279a73f6fe89410d SHA-1: 60b596c4e807fc2222460e0fbeb94241f182fa70 SHA-256: 64574dce2d9f3a67ab0148397ef154b8674fb6c34ef6986a6cc3048a08aa4158
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, with several pointing to disposable domains and link farms, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely used as a lure for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://vilenefex.ru/strik?utm_term=schaum+fourier+analysis+pdf PDF link annotation
    • http://kojazunupetip.mygamesonline.org/43043840011.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384150/normal_601f2998991ee.pdfIn PDF document text
    • http://wivevadevenumet.mywebcommunity.org/what_is_the_role_of_communication_in_education.pdfIn PDF document text
    • http://keruluzo.medianewsonline.com/239882407.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405654/normal_60293d3cec846.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481852/normal_5fe098b6a4b4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479460/normal_601baeb64078b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446401/normal_6031437c99f07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387718/normal_60660d05c0091.pdfIn PDF document text
    • http://kobazugipodiv.medianewsonline.com/makkar_ielts_speaking_topics_january_2020_download_free.pdfIn PDF document text
    • http://rajukilodagoje.mygamesonline.org/39444790570.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486037/normal_601ae657debf0.pdfIn PDF document text
    • http://mosebuzixat.mywebcommunity.org/rinase.pdfIn PDF document text
    • http://sivolejujivozul.scienceontheweb.net/budget_2020_date_july.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fedonefekipide.myartsonline.com/maharashtra_rto_passing_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5788220e-d407-4c9e-8811-0e4185ddf8e9/bexolivunu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b5dece3-e50d-4bd1-980e-20502dfd837a/bisonegojo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec348da8-de07-4601-96b7-3e8de1ed1fef/20984669609.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a62f06a5-4b40-4830-aae9-dc711369422a/libro_el_arte_de_la_seduccin_descargar_gratis.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD633 5400 bytes
SHA-256: f4a86c1eeeca81d25610f5893b0bbc0fbe27e5cafe9671524fc20d6a4b327fd5
font_01_sfnt_off0000e85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85D 11220 bytes
SHA-256: d2e005d6ae2737d60f1a4f3f72807d52b80a6fa46fba2e31135302b0eb2b4ae9
font_02_sfnt_off00010e00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E00 16140 bytes
SHA-256: 2732c78df68b4531e26da51a256f0f9ab881cb8a96d1886ade34872d88eeece3
font_03_sfnt_off000122fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FD 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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